For most adults, 4 to 8 ounces (half a cup to one cup) of apple juice per day is enough to help soften stools and ease mild constipation. For infants over one month old, the guideline is much smaller: 1 ounce per month of age per day, up to a maximum of 4 ounces. The right amount depends on age, and more isn’t necessarily better.
Why Apple Juice Helps With Constipation
Apple juice contains sorbitol, a sugar alcohol that your body absorbs slowly. When sorbitol reaches the large intestine only partially absorbed, it pulls water into the bowel through osmosis, softening the stool and making it easier to pass. Fructose in apple juice has a similar effect. Together, these two compounds give apple juice a mild natural laxative quality that works without stimulating the gut the way stronger laxatives do.
This mechanism is gentle, which is why apple juice is often one of the first things parents try for a constipated baby or toddler. It’s also why drinking too much can tip things in the other direction and cause diarrhea.
Amounts for Infants Under 12 Months
The American Academy of Pediatrics generally recommends against giving fruit juice to babies under 12 months. The exception is constipation. For infants over one month old who are on breast milk or formula, the guideline from HealthyChildren.org is straightforward: give 1 ounce (30 mL) per month of age per day. A two-month-old would get 2 ounces, a three-month-old would get 3 ounces, and so on, up to a maximum of 4 ounces (120 mL) regardless of age.
Both apple juice and pear juice are recommended options. You can offer it between feedings, either straight or diluted with an equal part of water if your baby hasn’t had juice before. Diluting it can reduce the chance of stomach upset while still delivering enough sorbitol to help.
Amounts for Toddlers and Young Children
For children ages 1 to 6, the AAP recommends limiting all fruit juice to 4 to 6 ounces (120 to 180 mL) per day. That range works well for constipation relief too. Four ounces given with a meal is a reasonable daily amount that stays within safety guidelines while providing enough sorbitol to make a difference.
Children’s Hospital of Philadelphia advises increasing water and juice intake for constipated kids over age 1, though without a specific number beyond the general AAP limits. The practical approach is to start with 4 ounces a day and see if stools soften within a day or two before increasing to 6 ounces. Pairing the juice with high-fiber foods like whole fruits, vegetables, and whole grains will be more effective than relying on juice alone.
Amounts for Adults
Adults can typically drink 4 to 8 ounces of apple juice once or twice daily to help with mild constipation. Starting at the lower end lets you gauge how your body responds. Because apple juice is high in sugar (about 24 grams per 8-ounce glass) and lacks the fiber of a whole apple, it works best as a short-term remedy rather than a daily habit.
Drinking it on an empty stomach can cause gas and bloating due to the rapid sugar load hitting your gut. Having it with a meal or snack slows absorption and reduces that discomfort.
Apple Juice vs. Prune and Pear Juice
All three juices contain sorbitol, but in different concentrations. Prune juice has the highest sorbitol content of the three, which makes it the most potent natural option for constipation. Pear juice falls in the middle. Apple juice has the lowest sorbitol level, making it the gentlest choice and the one least likely to cause cramping or diarrhea.
For babies and young children, apple and pear juice are typically preferred because they’re milder and better tolerated. For adults with stubborn constipation, prune juice may work faster. If you find apple juice isn’t enough on its own, switching to prune juice or alternating between the two can help.
Risks of Drinking Too Much
The sorbitol and fructose that make apple juice helpful for constipation can cause problems in larger quantities. Excessive intake leads to osmotic diarrhea, where too much water is drawn into the bowel. This is especially risky for infants and toddlers, who can become dehydrated quickly from persistent loose stools.
There’s also a dental concern. Fruit juice is acidic, and the sugars feed bacteria in the mouth that erode tooth enamel over time. For children, the AAP recommends offering juice in a cup rather than a bottle or sippy cup and limiting sipping throughout the day. For adults, rinsing your mouth with water after drinking juice helps reduce acid exposure.
Regular overconsumption of juice can also contribute to excess calorie intake without much nutritional payoff. Apple juice has almost none of the fiber found in a whole apple. If constipation is recurring, increasing your fiber intake through whole fruits, vegetables, and whole grains is a more sustainable solution than relying on juice day after day.